Knife or scissors sharpener.



I Witnesses 43W PATENTED JULY 18, 1905.

'D. B. DONALDSON. KNIFE 0R SGISSORS SHARPBNER.

APPLICATION FILED MAR. 1, 1905.

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6.71;,W Attorneys UNITED STATES Patented July 18, 1905.

PATENT OFFICE.

DAVID B. DONALDSON, OF DUNMORE, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO EVAN FUDAVIS, OF DUNMORE, PENNSYLVANIA.

KNIFE OR SCISSORS SHARPENER.

SPECIFICATION forming part of Letters Patent No. 794,854, dated July 18, 1905.

Application filed March 1, 1905. Serial No. 247,926.

To all 1077/0111 it 'HI/(Y/Z/ concern:

Be it known that 1, DAVID B. DONAL'DSON, a citizen of the United States. residing at Dunmore, in the county of Lackawanna and State of Pennsylvania, have invented a new and useful Knife or Scissors Sharpener, of which the following is a specification.

This invention relates to devices for sharpening carving and butcher knives, scissors, and like implements requiring a coarse cutting edge and which may also be employed for sharpening scythes, reapinghooks, cradleblades, grass-cutters, and similar implements, and has for its object to simplify and improve the construction and increase the efficiency and scope of devices of this character.

l/Vith these and other objects in view, which will appear as the nature of the invention is better understood, the same consists in certain novel features of construction, as hereinafter fully described and claimed.

1n the accompanying drawings, forming a part of this specification, and in which corresponding parts are denoted by like designating characters, is illustrated the preferred formof embodiment of the invention capable of carrying the same into practical operation, it being understood that the invention is not necessarily limited thereto, as various changes in the shape, proportions, and general assemblage of the parts may be resorted to without departing from the principle of the invention or sacrificing any of its advantages.

In the drawings thus employed, Figure 1 is a side elevation of the improved device ar' ranged as a knife-sharpener, and Fig. 2 is a plan view showing the device arranged as a scissors-sharpener. Fig. 3 is an end elevation with the device arranged as a knife-sharpener. Fig. 4 is an end view of the abrading members arranged as a scissors-sharpener.

The improved device consists of two drumlike members 10 11, disposed side by side and provided with V-shaped ribs 12 13, arranged spirally thereon from end to end. The drum tical standard 16, the latter supported in turn from a base 17, of any approved form. The

studs are connected at their outer ends by a yoke or link 18, the link having a transverse aperture at one end for receiving one of the studs and with an open slot 19 for detachably engaging the other stud. The opposite ends of the studs 14 15 are threaded and provided with wing-nuts 20 21 bearing against the outer face of the standard 16, by which means the spirally-ribbed drums are firmly clamped in position. By this simple arrangement an effective abrading implement is produced which will very quickly produce a cutting edge upon the blade (represented at 22) when the latter is drawn longitudinally of the drums and transversely of and in contact with the sharp edges of the V-shaped spirally-disposed ribs and with the cutting edge between the drums at their contact-points.

One of the drums is formed with one side flattened, as at 23, to provide a rest for the blades of a pair of scissors or shears, as illustrated in Figs. 2 and 3, or any other implement having a similarly-formed cutting edge.

The drum members are of hardened steel, and when one part of the ribs becomes worn and dull a slight rotative adjustment will bring new and sharp portions into position, and thus quickly renew the device, and these adjustments may be repeated until the whole surface of the ribs has been worn dull. The total lengths of the spiral ribs are thus utilized for producing the required abrasive effect, and as required adjustments are relatively small each time the life of the device will be prolonged to a corresponding extent.

The device is simple in construction, effective in action, and can be readily adapted, as above noted, for any of the various forms of blades requiring a coarse cutting edge.

Having thus described the invention, what is claimed is A knife and scissors sharpener comprising two drums arranged side by side and provided 5 with V-shaped ribs disposed spirally thereon from end to end, and one of said drums flattened on one side, and means for rotatively adjusting said drums.

In testimony that I claim the foregoing as my own I have hereto aflixed my signature in IQ the presence of two witnesses.

DAVID B. DON ALDSON.

Witnesses:

VICTOR E. WENZEL, R. L. WESTLAKE. 

